The pore size distribution and its relationship with shale gas capacity in organic-rich mudstone of Wufeng-Longmaxi Formations, Sichuan Basin, China

Zhang, Yu; Shao, Deyong; Yan, Jianping; Jia, Xiangjuan; Li, Yanfang; Yu, Ping; Zhang, Tongwei

doi:10.1016/j.jnggs.2016.08.002

Cited by 93 publications

(43 citation statements)

References 17 publications

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“…Additionally, Table 1 contains data on specific surface area of the samples and their total pore volume. In accordance with IUPAC classification, all samples exhibited IV type isotherm with final saturation plateau of specific length (or merely inflexion point) and typical hysteresis loop caused by the capillary condensation, characteristic for the mesoporous materials [35][36][37]. The hysteresis loop for CS and CS/GCN samples is similar to H2 (a) type hysteresis described by steep desorption branch assigned to the network effects such as pore-blocking/percolation in a narrow pore necks widths or evaporation via cavitation [36][37][38].…”

Section: Resultssupporting

confidence: 73%

Core/Shell Structure of Mesoporous Carbon Spheres and g-C3N4 for Acid Red 18 Decolorization

et al. 2019

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Spherical photocatalyst based on ordered mesoporous carbon and graphitic carbon nitride with core/shell structure (CS/GCN) was successfully synthesized via facile electrostatic self-assembly strategy. The photocatalytic properties of the hybrid were evaluated by the decomposition of Acid Red 18 under simulated solar light irradiation in comparison to the bulk graphitic carbon nitride (GCN). The results clearly revealed that coupling of carbon nitride with mesoporous carbon allows the catalyst to form with superior photocatalytic performance. The photoactivity of CS/GCN was over nine times higher than that of pristine GCN. Introducing mesoporous carbon into GCN induced higher surface area of the heterojunction and also facilitated the contact surface between the two phases. The synergistic effect between those two components enhanced the visible light-harvesting efficiency and improved photoinduced charge carrier generation, and consequently their proper separation. The electrochemical behavior of the obtained composite was also evaluated by electrochemical impedance, transient photocurrent response and linear sweep potentiometry measurements. The results confirmed that transport and separation of charge carriers in the hybrid was enhanced in comparison to the reference bulk graphitic carbon nitride. Detailed electrochemical, photoluminescence and radical scavenger tests enabled determination of the possible mechanism of photocatalytic process. This work presents new insights to design a core/shell hybrid through the simple preparation process, which can be successfully used as an efficient photocatalyst for the treatment of wastewater containing dyes under solar light irradiation.Catalysts 2019, 9, 1007 2 of 17 increase the surface area, the porosity in the structure of GCN can be additionally induced. Mesoporous photocatalysts received considerable research interest because they contain a special pore network, which facilitates the diffusion of the reactants and products. Moreover, the large surface area offers more active sites. Therefore, for an economical utilization of GCN, the researchers should strive to find the way for enhancing its photocatalytic properties [10,11].Up to now, different strategies, including introducing foreign elements, designing nanoporous structures, texturization, supramolecular assembly and creating effective heterojunctions, have been developed to enhance the photoactivity of GCN [12]. A large number of studies have confirmed that building a heterojunction system is an effective method to improve the separation efficiency of the photogenerated electrons and holes which dramatically improves the photocatalytic performance [13].To form an efficient heterojunction, GCN has been coupled with other semiconductors such as TiO , etc. [12,[14][15][16][17][18][19][20][21]. Unfortunately, the particles (often in the agglomerated form) were usually loaded randomly on the GCN sheets in composites causing low conjunction of GCN with a semiconductor which consequently limited charge transfer and...

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Section: Resultssupporting

confidence: 73%

Core/Shell Structure of Mesoporous Carbon Spheres and g-C3N4 for Acid Red 18 Decolorization

et al. 2019

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“…In addition, the empty symbols, which depict desorption curves (Figure 2a), had a slightly different pattern with adsorption. As shown in Figure 2b, the pore size distribution of ACs micropore clearly mixed the micropore and mesopores [24].…”

Section: Resultsmentioning

confidence: 81%

Regeneration of Activated Carbons Spent by Waste Water Treatment Using KOH Chemical Activation

Park¹,

Lee²,

Hong³

et al. 2019

Applied Sciences

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In this study, spent activated carbons (ACs) were collected from a waste water treatment plant (WWTP) in Incheon, South Korea, and regenerated by heat treatment and KOH chemical activation. The specific surface area of spent AC was 680 m2/g, and increased up to 710 m2/g through heat treatment. When the spent AC was activated by the chemical agent potassium hydroxide (KOH), the surface area increased to 1380 m2/g. The chemically activated ACs were also washed with acetic acid (CH3COOH) to compare the effect of ash removal during KOH activation. The low temperature N2 adsorption was utilized to measure the specific surface areas and pore size distributions of regenerated ACs by heat treatment and chemical activation. The functional groups and adsorbed materials on ACs were also analyzed by X-ray photoelectron spectroscopy and X-ray fluorescence. The generated ash was confirmed by proximate analysis and elementary analysis. The regenerated ACs were tested for toluene adsorption, and their capacities were compared with commercial ACs. The toluene adsorption capacity of regenerated ACs was higher than commercial ACs. Therefore, it is a research to create high value-added products using the waste.

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“…As can be seen in the isotherms presented in Fig. 4, it was possible to verify that along the desorption branch in the P/P 0 range 0.4 -0.45 (for N 2 at 77 K) all the samples presented a forced closure of the hysteresis loop, which can be explained by the tensile strength effect (TSE) [47][48][49] . In the pores with critical diameters smaller than 4 nm, the disappearance of the hysteresis occurs when there is a collapse of the hemispherical meniscus and the interconnected pores filled with N 2 are immediately emptied 47,49 .…”

Section: Textural Analysismentioning

confidence: 53%

Development of Silica-Based Monoliths for the Capture of CO2

2019

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The synthesis of mesoporous materials in macroscopic scale, as for example, the monoliths, has been of great interest in view of the wide range of applications that this material holds. Thus, this work consists of the production of silica monoliths for the purpose of they being used in the carbon dioxide (CO 2) adsorption process. The adsorbents were prepared in pure form and also with addition of heteroatoms: Al, Ti and Zr. The samples were then functionalized with pentaethylenehexamine (PEHA) by the wet impregnation method. The materials were characterized by the following techniques: X-ray diffraction (XRD), textural analysis, Fourier transform infrared spectroscopy (FTIR), Scanning electron microscopy (SEM) and Thermogravimetry (TG/DTG). The analyses indicated that the materials synthesized with heteroatom incorporation presented a disordered pore structure and high surface area (1387 m 2 /g for sample Ti/M1). In addition, they showed a significant increase in adsorption of CO 2 relative to their parent sample, a fact that is not much explored in the literature. The CO 2 adsorption performance tests were carried out at 30 ºC and atmospheric pressure. All functionalized materials demonstrated improved CO 2 adsorption capacity relative to their starting samples. Adsorption capacities up to 111.3 mg/g were found in this work, which makes the materials developed promising candidates for the capture of CO 2 .

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The pore size distribution and its relationship with shale gas capacity in organic-rich mudstone of Wufeng-Longmaxi Formations, Sichuan Basin, China

Cited by 93 publications

References 17 publications

Core/Shell Structure of Mesoporous Carbon Spheres and g-C3N4 for Acid Red 18 Decolorization

Core/Shell Structure of Mesoporous Carbon Spheres and g-C3N4 for Acid Red 18 Decolorization

Regeneration of Activated Carbons Spent by Waste Water Treatment Using KOH Chemical Activation

Development of Silica-Based Monoliths for the Capture of CO2

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